Heat Instant Pot on 'Saute' mode. Add oil, onions, ginger, garlic and green chilies, cook till onions are translucent, about 3~4 minutes.
Add 2 cups of water*, lentils and salt. Mix well.
Turn off the Saute mode and turn the IP on manual/ pressure cook mode.
Cook for 6 minutes with the venting knob in sealing position.
Wait for the pressure to reduce naturally.
Open the lid and mix well to combine. If the mixture looks too thick, add ¼~½ of water and simmer till heated through. Stir in lemon juice and mix well. Serve hot!!